[求助] 帮忙下载以下论文

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[Help] help download the following papers
A. Anand Kumar, (isbn:978-81-203-3356-7)
“Pulse and Digital Circuits”, PHI, 2012.Second Edition

Venkat Rao. K. Ramasudha K, Manmadha Rao G, (isbn:978-81-317-2135-3)
“Pulse and Digital Circuits,” Pearson Education, 2010

MS Prakash Rao (isbn:0-07-063421-1)
“ Pulse and Digital Circuits “  2007,TMH

UA Bakshi, you Godse (ISBN: 978-81-843-1042-9)
"Pulse and Digital Circuits"

Ronald J. Tocci
"Fundamentals of Pulse and Digital Circuits", 3rd Edition, Prentice Hall, 1990.